Question 1188420
<pre>
RATE            AMT.INV.         INTEREST
 12              40000-y         0.12(40000-y)
 15               y              0.15y
                40000             5800
</pre>
{{{12(40000-y)+15y=580000}}}


{{{12*40000-12y+15y=580000}}}

{{{(15-12)y=580000-12*40000}}}

{{{highlight(y=(580000-12*40000)/(15-12))}}}
Just simplify and compute this, and then evaluate the other invested quantity.



The amount at 15% looks like to be  33333.33 dollars.